We recommend a range of devices from a single user to a full conference room configuration: http://www.nefsis.com/Best-Video-Conferencing-Software/video-conferencing-equipment.html

Please contact your Nefsis account manager for more precise recommendations. In addition to price, its also important that we (or any audio integrator) have a good understanding of your users, your conference room, and the environment in which you'll be using the software.